ˈplæs.ɪd ˈkwaɪ.ɪt smuːð ˈtɹæŋ.kwɪl (of a body of water) free from disturbance by heavy waves a ribbon of sand between the angry sea and the placid bay the quiet waters of a lagoon a lake of tranquil blue water reflecting a tranquil blue sky a smooth channel crossing scarcely a ripple on the still water unruffled water free from emotional agitation or nervous tension the waiters were unflurried and good natured with contented mind and unruffled spirit